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authorAlexander Graf <agraf@suse.de>2010-08-24 15:48:50 +0200
committerAvi Kivity <avi@redhat.com>2010-10-24 10:51:29 +0200
commitfc678d67fee1acccf21322318dd833b892a572e4 (patch)
treef5ab551bbecdb38f877e933dbf3d600627eeb113 /drivers/s390/kvm/kvm_virtio.c
parent189be38db3dde12699a8b9dc22d33e8c95efe110 (diff)
downloadlinux-fc678d67fee1acccf21322318dd833b892a572e4.tar.bz2
KVM: S390: take a full byte as ext_param indicator
Currenty the ext_param field only distinguishes between "config change" and "vring interrupt". We can do a lot more with it though, so let's enable a full byte of possible values and constants to #defines while at it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'drivers/s390/kvm/kvm_virtio.c')
-rw-r--r--drivers/s390/kvm/kvm_virtio.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 4e298bc8949d..68cef4da15e8 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -334,7 +334,7 @@ static void kvm_extint_handler(u16 code)
{
struct virtqueue *vq;
u16 subcode;
- int config_changed;
+ u32 param;
subcode = S390_lowcore.cpu_addr;
if ((subcode & 0xff00) != VIRTIO_SUBCODE_64)
@@ -343,18 +343,25 @@ static void kvm_extint_handler(u16 code)
/* The LSB might be overloaded, we have to mask it */
vq = (struct virtqueue *)(S390_lowcore.ext_params2 & ~1UL);
- /* We use the LSB of extparam, to decide, if this interrupt is a config
- * change or a "standard" interrupt */
- config_changed = S390_lowcore.ext_params & 1;
+ /* We use ext_params to decide what this interrupt means */
+ param = S390_lowcore.ext_params & VIRTIO_PARAM_MASK;
- if (config_changed) {
+ switch (param) {
+ case VIRTIO_PARAM_CONFIG_CHANGED:
+ {
struct virtio_driver *drv;
drv = container_of(vq->vdev->dev.driver,
struct virtio_driver, driver);
if (drv->config_changed)
drv->config_changed(vq->vdev);
- } else
+
+ break;
+ }
+ case VIRTIO_PARAM_VRING_INTERRUPT:
+ default:
vring_interrupt(0, vq);
+ break;
+ }
}
/*